Filings Intelligence
Company filings profile · CIK 0000109657

GT Biopharma, Inc. — SEC filings & insider activity.

Real, source-linked SEC EDGAR activity for GT Biopharma, Inc. (GTBP): 7 filings in the last 90 days vs 10 in the prior 90 (filing-velocity cooling ↓ · 0.7×). Latest material 8-K events, insider Form-4 transactions, and periodic reports — monitored for change.

✔ Verified against the public SEC EDGAR filing record as of Sep 22, 2026. Source-linked, daily-refreshed.

Material 8-K events — GT Biopharma, Inc.

8-K disclosures decoded by item code (the material events: agreements, results, control/management changes, impairments, restatements).

FiledEvent
Sep 21, 2026Entry into a Material Agreement; Unregistered Sale of Securities; Item 3.03; Amendments to Bylaws/Charter; Financial Statements and Exhibits↗
Sep 15, 2026Entry into a Material Agreement; Unregistered Sale of Securities; Item 3.03; Amendments to Bylaws/Charter; Financial Statements and Exhibits↗
Sep 3, 2026Item 3.03; Amendments to Bylaws/Charter; Other Events; Financial Statements and Exhibits↗
Aug 14, 2026Item 5.07; Financial Statements and Exhibits↗
Jun 12, 2026Amendments to Bylaws/Charter; Financial Statements and Exhibits↗
May 22, 2026Delisting / Listing-Rule Failure; Financial Statements and Exhibits↗
Apr 7, 2026Entry into a Material Agreement; Financial Statements and Exhibits↗
Mar 2, 2026Non-Reliance on Prior Financials (restatement); Financial Statements and Exhibits↗
Nov 26, 2025Delisting / Listing-Rule Failure; Financial Statements and Exhibits↗
Nov 14, 2025Results of Operations (earnings); Financial Statements and Exhibits↗
Sep 26, 2025Item 3.03; Financial Statements and Exhibits↗
Sep 23, 2025Item 3.03; Financial Statements and Exhibits↗

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Insider transactions (Form 4 / 3 / 5)

FiledForm
Sep 8, 20254↗
Sep 8, 20254↗
Sep 8, 20254↗
Sep 8, 20254↗
Sep 8, 20254↗
Jul 30, 20253↗
Jun 3, 20253↗
May 29, 20253↗

Recent filings

FiledFormDetail
Sep 21, 20268-K Entry into a Material Agreement; Unregistered Sale of Securities; Item 3.03; Amendments to Bylaws/Charter; Financial Statements and Exhibits ↗
Sep 15, 2026SCHEDULE 13G ↗
Sep 15, 20268-K Entry into a Material Agreement; Unregistered Sale of Securities; Item 3.03; Amendments to Bylaws/Charter; Financial Statements and Exhibits ↗
Sep 3, 20268-K Item 3.03; Amendments to Bylaws/Charter; Other Events; Financial Statements and Exhibits ↗
Aug 14, 20268-K Item 5.07; Financial Statements and Exhibits ↗
Aug 14, 202610-Q 10-Q ↗
Jul 2, 2026DEF 14A DEF 14A ↗
Jun 18, 2026PRE 14A PRE 14A ↗
Jun 12, 20268-K Amendments to Bylaws/Charter; Financial Statements and Exhibits ↗
May 22, 20268-K Delisting / Listing-Rule Failure; Financial Statements and Exhibits ↗
May 15, 202610-Q 10-Q ↗
May 13, 2026EFFECT Item ; Item ; Item ↗
May 13, 2026424B3 424B3 ↗
May 11, 2026CORRESP ↗
May 6, 2026UPLOAD ↗
Apr 30, 2026S-1 S-1 ↗
Apr 7, 20268-K Entry into a Material Agreement; Financial Statements and Exhibits ↗
Mar 6, 202610-Q/A 10-Q/A ↗
Mar 6, 202610-Q/A 10-Q/A ↗
Mar 2, 202610-K 10-K ↗
Mar 2, 20268-K Non-Reliance on Prior Financials (restatement); Financial Statements and Exhibits ↗
Jan 30, 2026EFFECT Item ; Item ; Item ↗
Jan 30, 2026424B3 424B3 ↗
Jan 28, 2026CORRESP ↗
Jan 27, 2026UPLOAD ↗
Jan 21, 2026S-1 S-1 ↗
Jan 8, 2026424B3 424B3 ↗
Dec 2, 2025EFFECT Item ; Item ; Item ↗
Dec 2, 2025424B3 424B3 ↗
Dec 2, 2025CORRESP ↗
Nov 26, 20258-K Delisting / Listing-Rule Failure; Financial Statements and Exhibits ↗
Nov 14, 202510-Q 10-Q ↗
Nov 14, 20258-K Results of Operations (earnings); Financial Statements and Exhibits ↗
Oct 24, 2025S-1 S-1 ↗
Sep 26, 20258-K Item 3.03; Financial Statements and Exhibits ↗
Sep 23, 20258-K Item 3.03; Financial Statements and Exhibits ↗
Sep 8, 20254 ↗
Sep 8, 20254 ↗
Sep 8, 20254 ↗
Sep 8, 20254 ↗